Meaning of “index fossil” in the English Dictionary

american-english dictionary

"index fossil" in British English

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index fossilnoun [ C ]

/ˈɪn.deks ˌfɒs.əl/ /ˈɪn.deks ˌfɑː.səl/ specialized

a fossil that is found in many places and comes from the same time in history, so that scientists can use it to decide how old certain rocks are

(Definition of “index fossil” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"index fossil" in American English

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index fossilnoun [ C ]

/ˈɪn·deks ˌfɑs·əl/

earth science a fossil that is found in many places and comes from the same time in history, so that scientists can use it to decide how old certain rocks are

(Definition of “index fossil” from the Cambridge Academic Content Dictionary © Cambridge University Press)